WO2004109736A1

WO2004109736A1 - Contactor and switch

Info

Publication number: WO2004109736A1
Application number: PCT/JP2003/007269
Authority: WO
Inventors: Tsuyoshi Sekiguchi
Original assignee: Mitsubishi Denki Kabushiki Kaisha
Priority date: 2003-06-09
Filing date: 2003-06-09
Publication date: 2004-12-16
Also published as: TW200428446A; TWI220760B

Abstract

A contactor, comprising a fixed contact element (70) having a contact side conductor (170) installed in a housing (30) to easily perform a replacement operation in a short time and having a fixed contact (71) at a position opposed to a movable contact (51) on a movable contact element (50) and a screw side conductor (270) having terminal screws (275) for connecting the wire cables (100) of an electric circuit and detachably installed on the contact side conductor (170).

Description

Contactors and switches

Technical field

The present invention relates to a contactor and a switch for opening and closing a contact. Background technology '

Light

FIG. 16 shows a conventional contactor disclosed in Japanese Utility Model Publication No. 7-69592 (hereinafter simply referred to as Conventional Example 1). The conventional example 1 includes a rear housing part 1 and a front housing part 2 which are divided into two parts. The front housing part 2 has an opening on a predetermined axis, and a pair of fixed contacts 3 is arranged so as to sandwich the opening. Each fixed contact 3 has a fixed contact 4 fixed to an end adjacent to each other, and a terminal 6 having a terminal screw 5 at an end protruding outside the front housing portion 2 is extended. A contact support 7 is reciprocally guided between the fixed contacts 3 forming a pair, that is, through the opening of the front housing portion 2. A movable contact 8 is provided in a square window of the contact support 7. A movable contact 9 is fixed to each end of the movable contact 8, and the fixed contact 4 of the fixed contact 3 is bridged and opened via the movable contact 9. The movable contact 8 is configured such that a contact pressure with the fixed contact 3 is applied by a contact panel 10 mounted in the square window. The movable core 12 of the driving electromagnet 11 is connected to the contact support 7.

On the other hand, a fixed iron core 13 is fixed to the rear housing part 1. A winding frame 15 around which the exciting coil 14 is wound is fitted to the center pole of the fixed iron core 13. A conical return panel 16 is mounted between the front side flange of the bobbin 15 and the top piece of the movable iron core 12.

In Conventional Example 1 configured as described above, when the stationary core 13 is excited by energizing the exciting coil 14, the movable core 12 resists the elastic force of the return panel 16. It is sucked into the fixed iron core 13 together with the contact support 7. When the excitation coil 14 is turned off in this state, the movable core 12 returns to a position separated from the fixed core 13 together with the contact support 7 by the elastic restoring force of the return panel 16. The electric path between the terminals 6 and 6 is opened and closed between the fixed contact 4 of the fixed contact 3 and the movable contact 9 of the movable contact 8 by the attracting and separating operation by the electromagnet 10.

FIG. 17 shows a conventional contactor (hereinafter simply referred to as Conventional Example 2) disclosed in Japanese Patent Application Laid-Open No. 7-335109. The conventional example 2 includes a terminal portion 20 having a two-part configuration including a spoon-shaped terminal 21 and an inverted L-shaped fixed contact 22. The terminal 21 has through holes 21 a and 21 b through which the connecting screw 23 passes, and a terminal screw 24 at a position exposed to the outside. Has been. The fixed contact 22 has a fixed contact 25 attached to one end thereof, and a screw hole 22 a screwed to the connecting screw 23 at the other end.

In the conventional example 2 configured as described above, when the terminal portion 20 is used for the main pole, the position and orientation shown in FIG. 17, that is, the connection screw is connected to the screw hole 22 a through the through hole 21 b. By screwing 23, the fixed contact 22 is connected to the terminal 21.On the other hand, to use the terminal portion 20 for the neutral pole, the direction opposite to that of FIG. That is, the fixed contact 22 is connected to the terminal 21 by screwing the connection screw 23 into the screw hole 22 a through the through hole 21 a. In either case, the electric circuit is opened and closed by operating the movable contact 26.

By the way, in any of Conventional Example 1 and Conventional Example 2, when replacing the contactor itself for reasons such as contact life and preventive maintenance, loosen terminal screws 5, 24 and remove terminals 6, 2 The wiring cable must be removed from step 1, and after replacing the contactor, terminal screws 5, 24 must be tightened and the wiring cable must be connected to terminals 6, 21 again. Is complicated. General contactors often have multiple terminal screws. Therefore, the replacement work becomes more complicated, and much time is required for the power replacement work. Also, for example, if a thermal overload relay is connected to the contactor of Conventional Example 1 to form an electromagnetic switch, the terminal screws must be loosened when replacing the thermal overload relay. The wiring cable must be disconnected from the terminal, and after replacing the thermal overload relay, the terminal screws must be tightened and the wiring cable must be connected to the terminal again, causing the same problem. become.

Accordingly, the present invention has been made in order to solve the above-described problems, and an object of the present invention is to provide a contactor and a switch capable of easily performing a replacement operation in a short time and with a strong force. .

In order to achieve the above object, a contactor according to the present invention includes a fixed contact provided on a housing made of an electrically insulating material, and a movable contact provided movably with respect to the housing. A contactor that opens and closes an electric circuit by moving a movable contact of the movable contact to and away from the fixed contact of the movable contact, wherein the fixed contact is attached to the housing, and a portion of the movable contact facing the movable contact. A contact-side conductor having fixed contacts, and a screw-side conductor having terminal screws for connecting a wiring cable of the electric circuit and detachably attached to the contact-side conductor. It is characterized by the following.

The contactor according to the next invention is the contactor according to the above invention, wherein when the screw-side conductor is mounted on the contact-side conductor, the screw-side conductor is maintained in an electrically connected state. It is characterized by further comprising a holding means for allowing the screw-side conductor to be detached from the contact-side conductor when the screw-side conductor is moved in a predetermined removal direction. The contactor according to the next invention is characterized in that, in the above invention, a direction in which the screw-side conductor is removed is orthogonal to a direction in which the wiring cable is pulled out from the terminal screw.

The contactor according to the next invention is the contactor according to the above invention, wherein the holding means is formed of an elastic material, and when the screw-side conductor is mounted on the contact-side conductor, the screw-side conductor is elastically pressed. It is characterized in that it is a clip member for restricting movement of the conductor in the removal direction. A contactor according to the next invention is characterized in that, in the above invention, the clip member is formed of a conductor having a smaller thickness than the contact-side conductor and the screw-side conductor.

The contactor according to the next invention is characterized in that, in the above invention, the clip member is provided on the contact-side conductor.

A contactor according to the next invention is characterized in that, in the above invention, the clip member is provided on the screw-side conductor.

The contactor according to the next invention is the contactor according to the above invention, wherein each of the contact-side conductor and the screw-side conductor is bent and formed, and when the contact-side conductor is attached with the screw-side conductor, a plurality of both are formed. Characterized in that they are brought into contact with each other.

The contactor according to the next invention is the contactor according to the above invention, wherein the screw-side conductor is provided with a terminal case made of an electrical insulating material, and the screw-side conductor is mounted on the contact-side conductor. A portion of the side conductor exposed to the outside of the housing is covered by the terminal case.

The contactor according to the next invention is characterized in that, in the above invention, the terminal portion case is formed integrally with the screw-side conductor.

The contactor according to the next invention is the contactor according to the above invention, in which the screw-side conductor is allowed to move relative to the terminal case in a direction in which the screw-side conductor is withdrawn, while a direction perpendicular to the direction. It is characterized by the provision of guide means to regulate the relative movement to

In the switch according to the next invention, a fixed contact is provided on a housing made of an electrically insulating material, and a movable contact is movably disposed with respect to the housing, and the movable contact is provided on a fixed contact of the fixed contact. A contactor that opens and closes an electric circuit by separating and moving a movable contact of the contactor; and a thermal overload relay connected to a fixed contactor of the contactor, wherein the contactor is attached to the housing. A contact-side conductor having a fixed contact at a position facing the movable contact of the movable contact; and a screw-side conductor having a terminal screw for connecting a wiring cable of the electric circuit. A first contact having a contact, wherein the thermal overload relay is detachably attached to the screw-side conductor, and a second contact detachably attached to the contact-side conductor. And an overload current is cut off between the first contact and the second contact when an overload current flows between the first contact and the second contact.

The switch according to the next invention is the switch according to the above invention, wherein when the screw-side conductor is attached to the first contact, a person is kept in an electrically connected state, while the screw-side conductor is held. First holding means for allowing the screw-side conductor to be detached from the first contact when the wire is moved in a predetermined removal direction, and when the second contact is attached to the contact-side conductor. And a second holding device that allows the second contact to be detached from the contact-side conductor when the second contact is moved in a predetermined removal direction. Means is further provided. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a cross-sectional view showing a contactor according to Embodiment 1 of the present invention, FIG. 2 is a cross-sectional view showing a state in which a screw-side conductor is detached from the contactor shown in FIG. Figure is a cross-sectional view showing the contactor shown in Fig. 1 with the wiring cable removed, and Fig. 4 is a plan view showing the main part of the front housing part applied to the contactor shown in Fig. 1. FIG. 5 is a plan view of a main part showing a state in which the screw-side conductor is mounted on the front housing part shown in FIG. 4, and FIG. 6 (a) is applied to the contactor shown in FIG. FIG. 6 (b) is a perspective view of the terminal case applied to the contactor shown in FIG. 1 as viewed from the outside, and FIG. 7 is a perspective view of the terminal case as viewed from the inside. FIG. 8 is a cross-sectional view of a main part of a first modification of the contactor shown in FIG. 1, FIG. 8 is a cross-sectional view of a main part of a contactor as a second modification, and FIG. 9 (a) is a third modification. Is a contact 9 (b) is a sectional view of a main part showing a state in which the screw-side conductor is mounted on the contact-side conductor of the container. The screw-side conductor is separated from the contact-side conductor shown in Fig. 9 (a). 10 (a) is a perspective view of a terminal case of a contactor according to a fourth modification viewed from the outside, and FIG. 10 (b) is a sectional view of the first modification. 0A perspective view from the inside of the terminal case shown in FIG. FIG. 12 is a cross-sectional view showing a switch according to a second embodiment. FIG. 12 is a cross-sectional view showing a state in which a thermal overload relay and a screw-side conductor are separated from the switch shown in FIG. 11. Fig. 13 (a) is a perspective view of the thermal overload relay applied to the switch shown in Fig. 12 as viewed from the outside, and Fig. 13 (b) is the Fig. 13 (b). FIG. 14 (a) is a perspective view of the thermal overload relay shown from the inside, FIG. 14 is a plan view of a main part of the switch shown in FIG. 12, and FIG. Fig. 4 is a plan view of a main part showing a state in which the screw-side conductor is attached to the switch shown in Fig. 4. Fig. 16 is a cross-sectional view of a contactor of Conventional Example 1, and Fig. 17 is a contact of Conventional Example 2. It is sectional drawing of a container. Preferred embodiments of a contactor and a switch according to the present invention will be described below in detail with reference to the accompanying drawings.

Embodiment 1

FIG. 1 to FIG. 6 show a contactor according to Embodiment 1 of the present invention. The contactor exemplified here includes a housing 30 made of an electrically insulating material. The housing 30 has an electromagnet housing between the front housing 31 having a contact housing space 30a and the front housing 31 when the front housing 31 is attached to the front housing 31. And a rear housing part 32 that defines a space 30b.

The front housing portion 31 has an opening 30c along a predetermined axis between the contact housing space 30a and the electromagnet housing space 30b. The support 40 is provided so as to be able to reciprocate. At a portion of the support 40 corresponding to the contact accommodating space 30a, a square window 40a is provided, and a plurality of (three in the present embodiment) movable contacts 5 are provided in the square window 40a. 0 is arranged. The movable contact 50 is accommodated in the contact accommodating space 30a so as to extend from the square window 40a of the support 40 to both sides of the opening 30c. Movable contacts 51 are provided on both sides of the movable contact 50 and on the surfaces located on the side of the electromagnet accommodating space 30b. The movable contact 50 is pressed between the support 40 and the movable contact 50 toward the electromagnet housing space 30b. The contact panel 41 is interposed. A movable iron core 61 is connected to a portion of the support 40 corresponding to the electromagnet housing space 30b.

On the other hand, a fixed iron core 62 is fixed to the electromagnet accommodating space 30b in the rear housing portion 32. The fixed iron core 62 is provided with a winding frame 64 around which an excitation coil 63 is wound around a center pole, and forms an electromagnet 60 together with the movable iron core 61. Between the front side flange of the winding frame 6 4 and the top piece of the movable core 6 1, there is a conical return panel 6 5 that keeps the movable core 6 1 always separated from the fixed core 6 2. Let me do it. Further, a plurality of fixed contacts 70 (three pairs in this embodiment) are provided in the front side housing part 31 of the contactor at a position facing each other across the opening 30c. There is. Each fixed contact 70 is composed of a contact-side conductor 170 mounted on the front housing 31 and a screw-side conductor 2 detachably attached to each contact-side conductor 170. 70.

The contact-side conductor 170 is formed by a relatively thick flat plate-shaped conductor plate, so the first contact-side conductive part 171, the second contact-side conductive part 172, and the third contact-side It has a conductive portion 173 and a fourth contact-side conductive portion 174. The first contact side conductive portion 17 1 extends from the portion of the movable contact 50 facing the movable contact 51 inside the contact receiving space 30 a toward the outside of the front housing portion 31. This is a portion exposed to the outside through a through hole 31a provided in the front housing portion 31. In the first contact-side conductive portion 171, a fixed contact 71 is provided at a portion facing the movable contact 51 in a portion located inside the contact accommodating space 30a. The second contact-side conductive portion 172 is a portion bent from the outer end of the first contact-side conductive portion 171 to the rear side and extends along the outer surface of the front housing portion 31. The third contact-side conductive portion 173 is a portion bent and extended from the extending end of the second contact-side conductive portion 172 to the outside of the front housing portion 31. The fourth contact-side conductive portion 174 is a portion bent and extended from the extending end of the third contact-side conductive portion 173 toward the rear side, and has a clip member 80 on its outer surface. I have.

The clip member 80 is a thinner and more elastic plate than the contact-side conductor 170. It is formed by a conductor plate to be formed, and has a mounting portion 8 mm and a holding portion 82. The mounting portion 81 is a portion that extends in a flat plate shape, and is fixed to the outer surface of the fourth contact-side conductive portion 174 via the outer surface. The holding portion 82 is a portion that extends from the rear end of the mounting portion 81 toward the front. The extending end of the holding portion 82 is returned to the normal state, gradually approaching the mounting portion 81 toward the front side, and the distance between the foremost portion and the mounting portion 81 is set to the contact-side conductor. It is configured to be smaller than the plate thickness of 170 and a screw-side conductor 270 described later.

As shown in FIG. 4, the contact-side conductors 170 are arranged side by side in the arrangement areas 31 b provided on both sides of the front housing part 31. The housing-side guide grooves 33 face each other along the extending direction of the fourth contact-side conductive portion 174 on both side edges of each arrangement region 31b in the front housing portion 31. It has been extended. The housing-side guide groove 33 constitutes guide means by a case-side guide rib 91 of a terminal case 90 described later.

The screw-side conductor 270 is formed by a flat conductor plate having substantially the same thickness as the contact-side conductor 170, and the first screw-side conductor 271 and the second screw Side conductive portion 272, a third screw side conductive portion 273, and a fourth screw side conductive portion 274. The first screw-side conductive portion 271 is a portion provided with a terminal screw 275 for connecting a wiring cable 100 of an electric circuit. The terminal screw 275 is mounted in a direction orthogonal to the first screw side conductive portion 271. The second screw-side conductive portion 2.72 is formed by bending and extending from the inner end of the first screw-side conductive portion 271 toward the rear side, and is provided with the first screw-side conductive portion 1701. (2) A portion for contacting the outer surface of the conductive portion (172) on the contact side. The third screw-side conductive portion 273 extends outward from the extending end of the second screw-side conductive portion 272, and extends to the third contact point of the contact-side conductor 170. This is a part for contacting the outer surface of the side conductive part 173. The fourth screw-side conductive portion 274 is bent and extended from the extending end of the third screw-side conductive portion 273 toward the back side, and contacts the mounting portion 81 of the clip member 80. This is a portion that is pressed and held between the holding portion 82 and the holding portion 82. The screw-side conductor 270 is attached to the terminal case 90 for each of the contact-side conductors 170 arranged side by side in the respective placement areas 3 1 b of the front housing part 31. . The terminal case 90 is made of an electrically insulating material in the same manner as the housing 30, and as shown in FIG. 6, the outer surface of the first screw side conductive part 271, the second screw side conductive part Each screw-side conductor 270 is held such that the outer surface of the part 272, the outer surface of the third screw-side conductive part 273, and the fourth screw-side conductive part 274 are respectively exposed to the outside. are doing. The arrangement area of the first screw-side conductive portion 271 in each screw-side conductor 270 is separated from each other by a partition wall 92, and the entry of a tool for operating the terminal screw 275 is allowed. On the other hand, the situation in which a human hand touches the first screw side conductive part 271 and the terminal screw 275 is restricted. The terminal case 90 is provided with a pair of case-side guide ribs 91 and a case-side cover portion 93. The case-side guide ribs 91 are provided on both side surfaces of the terminal case 90 and project from the edge located on the inner side toward the outer side, respectively. It extends so as to be parallel to 4. The case-side cover portion 93 is a portion provided so as to cover an outer region of each fourth screw-side conductive portion 274. A sufficient gap is provided between the case-side force par portion 93 and the fourth screw-side conductive portion 274 to accommodate the holding portion 82 of the clip member 80.

Each screw-side conductor 270 mounted on the terminal case 90 is connected to the housing-side guide rib 91 with the fourth screw-side conductive portion 274 facing the rear side. Align the groove 3 3 and move the case-side guide lip 9 1 along the housing-side guide groove 3 3 to the rear side.As shown in Fig. 3, the fourth screw-side conductive part 2 7 4 clips. It is held between the mounting portion 81 and the holding portion 82 of the member 80 by the elastic pressing force. In this case, the position of the screw-side conductor 270 is defined by the third screw-side conductor 273 contacting the third contact-side conductor 173 of the contact-side conductor 170. Will be. As shown in FIG. 1, a wiring cable 100 of an electric circuit is connected to each of the terminal screws 275. The drawing direction C of the wiring cable 100 connected to the terminal screw 2 75 is almost perpendicular to the direction D in which the fourth screw-side conductive portion 274 of the screw-side conductor 270 extends. It is. In this state, when the stationary core 62 is excited by energizing the exciting coil 63, the movable core 61 attracts the stationary core 62 together with the support 40 against the elastic force of the return panel 65. Is done. When the excitation coil 63 is de-energized from this state, the movable core 61 returns to the position separated from the fixed core 62 together with the support 40 by the elastic restoring force of the return spring 65. The electric circuit can be opened and closed between the fixed contact 71 of the fixed contact 70 and the movable contact 51 of the movable contact 50 by the attraction / separation operation by the electromagnet 60.

Here, according to the contactor, the screw-side conductor 270 and the contact-side conductor 170 are in contact with each other on a plurality of surfaces extending in different directions. That is, the fourth screw-side conductive portion 274 contacts the fourth contact-side conductive portion 174 via the clip member 80, and the third screw-side conductive portion 273 becomes the third contact-side conductive portion 174. 3 and the second screw side conductive portion 272 is in contact with the second contact side conductive portion 172. A clip member 80 is provided between the screw-side conductor 27 0 and the contact-side conductor 170 to electrically connect the two by elastic pressing force. Therefore, even if a slight displacement occurs between the contact-side conductor 170 and the screw-side conductor 270 when the screw-side conductor 270 is attached, a sufficient contact area between the two can be secured. It becomes. As a result, there is no danger of an increase in the amount of heat generated due to the decrease in the contact area, and the housing 30 and the terminal case 90 are affected by heat, for example, the housing 30 and the terminal case 9. The life of 0 may not be reduced by the influence of heat.

In addition, portions of the contact-side conductor 170 that are exposed to the outside of the front-side housing 31, that is, the second contact-side conductive portion 172, the third contact-side conductive portion 1773, and the fourth contact-side conductive portion Each outer surface of the portion 17 4 ゃ clip member 80 0 force Both are covered by the case-side force par 9 3 ゃ screw-side conductor 2 70, and the screw-side conductor 2 70 The second screw side conductive portion 272, the third screw side conductive portion 273, and the fourth screw side conductive portion 274 force S are all covered by the terminal case 90. Accordingly, it is possible to prevent a worker who performs maintenance and inspection from accidentally touching the contact-side conductor 170 and the screw-side conductor 270. Furthermore, in the above contactor, when replacing the contactor itself for reasons such as the life of the contacts 51 and 71 and preventive maintenance, relax and tighten the terminal screw 275 as in Conventional Examples 1 and 2. There is no need to do any work. That is, according to the above contactor, if the terminal case 90 is moved to the front side with respect to the front housing portion 31, the screw-side conductive material is pressed against the elastic pressing force of the clip member 80. Since the body 270 can be separated from the contact-side conductor 170, the contactor can be replaced without loosening the terminal screw 275. Then, after replacing the contactor with a new one, if the terminal case 90 is attached to the front housing part 31 with the fourth screw-side conductive part 274 facing the back again, The screw-side conductive portion 274 is sandwiched between the mounting portion 81 of the clip member 80 and the holding portion 82, and the wiring cable 100 can be connected without fastening the terminal screw 275. become able to. Therefore, the replacement work becomes easy, and the time for the replacement work is significantly reduced. In addition, the above-described operation may be performed only for the two terminal case cases 90 mounted on both sides of the front-side housing 31 regardless of the number of the terminal screws 27.

On the other hand, even if a tensile force acts on the distribution cable 100 while using the contactor, the direction C of the fourth cable-side conductive part 274 of the screw-side conductor 270 is not This is a direction substantially perpendicular to the extending direction D. Therefore, there is no danger that the screw-side conductor 270 is inadvertently detached from the contact-side conductor 170 by the tensile force of the distribution cable 100, and the connection state between the two is reliably maintained.

Moreover, since the case-side guide ribs 91 of the terminal case 90 are engaged with the housing-side guide grooves 33 of the front housing portion 31, the tensile force of the wiring cable 100 is directly applied to the contact-side conductor 1 It does not act on 70, and may lead to displacement of the fixed contact 71 of the contact-side conductor 170. As a result, the contact area between the fixed contact 71 and the movable contact 51 is not reduced, and the life of the contacts 51 and 71 due to the reduced contact area is not likely to be reduced. .

In the first embodiment described above, the second screw-side conductive portion 272, the third screw-side conductive portion 273, and the fourth screw-side conductive portion 274 of the screw-side conductor 270 are contacted, respectively. ~ side When positioning is performed by contacting the second contact side conductive part 172, the third contact side conductive part 173, and the fourth contact side conductive part 174 of the conductor 170, respectively. Although both are electrically connected, the present invention is not limited to this. For example, as shown in FIG. 7, between the front housing part 31 and the terminal case 90, contact surfaces 34, 94 substantially perpendicular to the direction of insertion and removal of the terminal case 90 are provided. The front side housing portion 31 and the terminal portion case 90 may be positioned by contacting these contact surfaces 34 and 94 with each other. In the example shown in Fig. 7! The second contact-side conductive part 172 of the contact-side conductor 170, the fourth contact-side conductive part 174, and the second screw-side conductive part of the screw-side conductor 270 The contact between the second screw-side conductive portion 274 and the fourth screw-side conductive portion 274 results in the electrical connection therebetween.

Further, in the first embodiment described above, the clip member 80 is fixed to the outer surface of the fourth contact-side conductive portion 174 of the contact-side conductor 170, as shown in FIG. As described above, the clip member 80 may be fixed to the inner surface of the fourth contact-side conductive portion 174 of the contact-side conductor 100. In this case, when the screw-side conductor 270 is attached to the contact-side conductor 170, the fourth contact-side conductor 174 directly contacts the fourth screw-side conductor 274. Therefore, it is possible to further reduce the increase in the amount of heat generated by energization.

Further, in the above-described first embodiment, the clip member 80 is fixed to the contact-side conductor 170, but may be reversed. That is, as shown in FIG. 9, the clip member 80 is fixed to the inner surface of the fourth screw-side conductive portion 274 of the screw-side conductor 270 via the mounting portion 81, while the contact-side conductive The fifth screw-side conductive part 175 that is folded back toward the front side is further provided on the fourth screw-side conductive part 174 of the body 170, and the screw-side conductor 270 is connected to the contact-side conductor 1 When mounted on 70, the 5th contact-side conductive portion 1 75 of the contact-side conductor 170 is pressed and clamped between the mounting portion 81 of the clip member 80 and the holding portion 82. You can. Thus, according to the contactor in which the clip member 80 is fixed to the screw-side conductor 270, the number of parts to be replaced can be reduced. In other words, since the tulip member 80 can be reused even after the replacement, the cost associated with the replacement can be reduced.

Further, in the first embodiment described above, the screw-side conductor 270 is attached to the terminal case 90, but for example, as shown in FIG. 10, insert molding is used. If the terminal case 90 and the screw-side conductor 270 are integrally formed, the number of parts can be reduced and the contactor can be easily assembled. Also, in the first embodiment described above, the contact for opening and closing the electric circuit between the fixed contact 71 of the fixed contact 70 and the movable contact 51 of the movable contact 50 by the attraction / separation operation by the electromagnet 60 is described. The contactor is not limited to the one that opens and closes the electric circuit by the attraction / separation operation of the electromagnet 60, but also the contactor that opens and closes the electric circuit by operating a manual lever, for example. Of course, it is possible to apply.

Embodiment 2.

FIGS. 11 to 15 show a switch according to a second embodiment of the present invention. The switch exemplified here is configured by connecting the thermal overload relay 110 to the fixed contactor 70 of the contactor described in the first embodiment. The configuration other than the thermal overload relay 110 is the same as that of the embodiment, and thus the same reference numerals are given and the detailed description thereof is omitted.

The thermal overload relay 110 is energized by the action of the mechanism 113 when an overload current flows between the first contact 111 and the second contact 112. It is provided with a relay housing 114 in which the mechanical section 113 is built-in, in order to prevent a situation in which a driving target such as a motor is damaged by shutting off the motor. The relay housing 114 is made of an electrically insulating material, and has a case connecting portion 115 at a portion located on the outer side, and has a housing connecting portion 116 at a portion located on the inner side. are doing.

The case connection part 115 is a part for mounting the terminal case 90 of the contactor, and the second clip is attached to the part corresponding to the fourth screw side conductive part 274 of the terminal case 90. In addition to having the members 117, the terminal-side case 90 has housing-side guide grooves 118 at positions corresponding to the case-side guide ribs 91, respectively. No. 2 The clip member 117, like the clip member 80 provided for the contact-side conductor 170, is formed by a thin, elastic, flat plate-shaped conductor plate. 7 and a second holding portion 1 1 7 2. The second mounting portion 1 1 7 1 is a portion extending in a flat plate shape, and is fixed to the outer surface of the first contact 1 1 1 built in the relay housing 1 1 4 via the outer surface. . The second sandwiching portion 1172 is a portion that extends from the rear end of the second mounting portion 1171 toward the front. In the normal state, the extending end of the second holding portion 1 1 7 2 gradually approaches the mounting portion 1 1 7 1 toward the front side, and the leading end portion and the second mounting portion 1 1 7 1 Is configured to be smaller than the thickness of the screw-side conductor 270. The housing-side guide groove 1 18 has the same dimensions as the housing-side guide groove 33 provided in the front-side housing portion 31, and has a second mounting portion 1 1 2 on the second clip member 117. 7 It extends along the extension direction of 1.

The housing connection part 1 16 is a part for connecting to the arrangement area 3 1 b where the contact-side conductors 170 are arranged side by side in the housing part 31 on the front side of the contactor. Is constructed by projecting a portion located on the front side. The housing connecting portion 1 16 is provided with three second contacts 1 12, three housing-side covers 1 19, and a pair of housing-side guide ribs 120. The second contactors 112 project from the rear surface of the housing connecting portion 116, and are arranged corresponding to the clip members 80 of the front housing portion 31, respectively. The housing-side cover portion 119 is a portion provided so as to cover the outer region of each of the second contacts 112, and protrudes from a surface facing the rear side in the housing 30 portion. On the housing side, a sufficient gap is provided between the cover portion 1 19 and the second contact 1 1 2 to accommodate the second holding portion 1 1 7 2 of the second tulip member 1 17 . The housing-side guide ribs 120 protrude outward from the inner edge on both sides of the housing connection portion 116, respectively, and are parallel to the second contactor 112. It extends to become. These housing-side guide lips 120 are formed to have the same dimensions as the case-side guide ribs 91 provided on the terminal case 90. In the thermal overload relay 110 configured as described above, the housing-side guide lip 120 is matched with the housing-side guide groove 33 with the second contactor 112 facing the rear side. If the guide ribs 120 on the housing side are moved to the rear side along the guide grooves 33 on the housing side as they are, as shown in FIG. It is sandwiched between 81 and the holding portion 82 by its elastic pressing force.

Further, the terminal case 90 is attached to the case connection portion 115 of the thermal overload relay 110 to constitute a switch. That is, the case-side guide ribs 91 are respectively aligned with the case-side guide grooves 1 18 with the fourth screw-side conductive portion 274 facing the rear side, and the case-side guide ribs 91 are directly connected to the case-side guide grooves 1 1 If it is moved to the back side along 8, the fourth screw side conductive part 2 7 4 will be between the second mounting part 1 17 1 of the second clip member 1 17 and the second holding part 1 17 2. Is held by the elastic pressing force. A wiring cable 100 of an electric circuit is connected to each terminal screw 275. The lead-out direction of the wiring cape 100 connected to the terminal screw 275 should be substantially perpendicular to the direction in which the fourth screw-side conductive portion 274 of the screw-side conductor 270 extends. is there.

In this switch, when the stationary core 62 is excited by energizing the exciting coil 63, the movable core 61 resists the elastic force of the return panel 65 and the fixed core 40 together with the support 40. 6 Sucked in 2. In this state, when the excitation coil 63 is de-energized, the movable core 61 returns together with the support 40 to a position separated from the fixed core 62 by the elastic restoring force of the return panel 65. The electric circuit can be opened and closed between the fixed contact 71 of the fixed contact 70 and the movable contact 51 of the movable contact 50 by the attraction Z separating operation by the electromagnet 60.

During this time, if an overload current flows between the first contact 1 1 1 and the second contact 1 1 2, the mechanical section 1 1 3 of the thermal overload relay 1 1 It operates and shuts off the current to prevent damage to the motor or other drive target.

Here, according to the above-described switch, between the screw-side conductor 270 and the first contact 1 11, In addition, a second tulip member 117 and a clip member 80 are provided between the second contactor 112 and the contact-side conductor 170 to electrically connect them by elastic pressing force. It is. Therefore, if the terminal case 90 or the thermal overload relay 110 is mounted, the contact between the screw-side conductor 270 and the first contact 1 11 1 or the second contact 1 1 2 Even if a slight displacement occurs between the contact-side conductor 170 and the contact-side conductor 170, a sufficient contact area between them can be ensured. As a result, there is no danger of an increase in the amount of heat generated due to the reduction in the contact area, and the housing 30, the relay housing 114, and the terminal case 90 are affected by heat, such as the housing 3. 0, relay housing 1 14 and terminal case 90 do not cause the life to be shortened by the influence of heat.

In addition, portions of the contact-side conductor 170 that are exposed outside the front-side housing portion 31, that is, the second contact-side conductive portion 172, the third contact-side conductive portion 173, and the fourth contact-side conductive portion Each outer surface of the part 17 4 ゃ clip member 80 is to be covered by the housing side power part 1 19 and the relay housing 1 14, and the second tulip member 1 17 is connected to the terminal This is covered by the case side force par portion 93 of the case 90. Therefore, it is possible to prevent a worker performing maintenance and the like from accidentally touching the contact-side conductor 170 and the screw-side conductor 270.

Further, in the above-mentioned switch, when the switch itself is replaced for the reason of changing the capacity of a drive object such as a motor, for example, there is no need to loosen / fasten the terminal screw 275. In other words, according to the above switch, if the terminal case 90 is moved to the front side with respect to the relay casing 114, the screw-side conductive member resists the elastic pressing force of the second tulip member 117. The body 270 can be detached from the first contactor 111, and if the relay housing 111 is moved to the front side with respect to the front housing part 31, the clip member 80 Since the second contactor 1 1 2 can be separated from the contact-side conductor 17 0 against the elastic pressing force of the contact, the thermal screw type overload relay without loosening the terminal screw 2 7 5 1 1 Exchange of 0 becomes possible. After that, after replacing it with a new thermal overload relay 110, correct the position with the second contactor 112 facing back again. When the relay housing 1 1 4 is attached to the front housing 3 1, the second contact 1 1 2 is pressed and clamped by the clip member 80, and the screw-side conductor 2 70 is turned to the back side. If the terminal case 90 is attached to the relay housing 1 14 in this state, the fourth screw-side conductive portion 274 is pressed and sandwiched by the second tulip member 117, and the terminal screw 275 is fastened. The thermal overload relay 110 can be connected without any problem. Therefore, the replacement work becomes easy, and the time for the replacement work is significantly reduced. In addition, the above-described operation need only be performed for the thermal overload relay 110 and the terminal case 90 connected thereto regardless of the number of terminal screws 275.

On the other hand, even if a tensile force acts on the distribution cable 100 while the switch is in use, the direction is the fourth screw-side conductive portion 274 of the screw-side conductor 270, and The directions are substantially perpendicular to the second contacts 1 1 and 2 respectively. Therefore, there is no danger that the screw-side conductor 270 will be accidentally detached from the first contact 111 due to the pulling force of the wiring cap 100, and the second contact 111 will not contact the contact-side conductor. There is no risk of inadvertent detachment from the body 170, and the electrical connection state is reliably maintained in each case.

In addition, the tensile force of the wiring cable 100 is such that the case-side guide ribs 91 of the terminal case 90 engage with the housing-side guide grooves 1 18 of the relay case 114 to generate a force. Since the housing side guide rib 1 1 4 of 1 4 is engaged with the housing side guide groove 3 3 of the front housing 3 1, it does not directly act on the contact side conductor 1 70, and the contact side This does not lead to displacement of the fixed contact 71 of the conductor 170. As a result, there is no possibility that the contact area between the fixed contact 71 and the movable contact 51 is reduced, and there is no possibility that the life of the contact is shortened due to the reduced contact area.

As described above, according to the contactor of the present invention, the fixed contact is provided on the housing made of an electrically insulating material, and the movable contact is movably disposed on the housing. A contactor that opens and closes an electric circuit by moving a movable contact of the movable contact to and away from a fixed contact of the movable contact, wherein the fixed contact is attached to the housing and faces the movable contact of the movable contact. Firm on the part A contact-side conductor having a constant contact; and a screw-side conductor having a terminal screw for connecting a wiring cable of the electric circuit, and having a force and being detachably attached to the contact-side conductor. Since the terminal screws are provided, there is no need to tighten and loosen the terminal screws for replacement, and this operation can be performed easily and quickly.

According to the switch of the present invention, a fixed contact is provided on a housing made of an electrically insulating material, and a movable contact is movably disposed with respect to the housing, and the fixed contact of the fixed contact is provided. A contactor that opens and closes an electric circuit by moving a movable contact of the movable contact to and away from the contactor; and a thermal overload relay connected to a fixed contactor of the contactor. A contact-side conductor having a fixed contact at a position facing the movable contact of the movable contact, and a screw-side conductor having a terminal screw for connecting a wiring cable of the electric circuit. The thermal overload relay comprises a first contact on which the screw-side conductor is detachably attached, and a detachable attachment on the contact-side conductor. The first It has two contacts and cuts off the overload current between the first contact and the second contact when it flows. There is no need for fastening / relaxing, and the work can be performed easily and in a short time. Industrial applicability

As described above, according to the present invention, a fixed contact is provided on a housing made of an electrically insulating material, and a movable contact is disposed movably with respect to the housing, and the fixed contact of the fixed contact is provided on the fixed contact of the fixed contact. It is suitable for a contactor that opens and closes an electric circuit by moving the movable contact of a movable contact, and a switch that connects a thermal overload and a relay to the fixed contact of this contactor.

Claims

The scope of the claims

1. A fixed contact is provided on a housing made of an electrically insulating material, and a movable contact is disposed so as to be movable with respect to the housing, and a movable contact of the movable contact is separated from a fixed contact of the fixed contact. Contactor that opens and closes the electrical circuit by contacting it.

The fixed contact,

A contact-side conductor attached to the housing and having a fixed contact at a portion facing the movable contact of the movable contact;

A screw-side conductor having terminal screws for connecting a wiring cable of the electric circuit, and being detachably attached to the contact-side conductor;

A contactor comprising:

2. When the screw-side conductor is attached to the contact-side conductor, both are maintained in an electrically connected state, while when the screw-side conductor is moved in a predetermined removal direction, the contact-side 2. The contactor according to claim 1, further comprising a holding unit that allows the screw-side conductor to be detached from the conductor.

3. The contactor according to claim 1, wherein a direction in which the screw-side conductor is removed is orthogonal to a direction in which the wiring cable is drawn out from the terminal screw.

4. The holding means is formed of an elastic material, and when the screw-side conductor is attached to the contact-side conductor, the screw-side conductor moves in the removal direction by elastic pressing force. The clip member for regulating, according to claim 2, characterized in that

5. The clip member is thicker than the contact-side conductor and the screw-side conductor. 5. The contactor according to claim 4, wherein the contactor is formed by a thin conductive material.

6. The contactor according to claim 5, wherein the clip member is provided on the contact-side conductor.

7. The contactor according to claim 5, wherein the clip member is provided on the screw-side conductor.

8. The contact-side conductor and the screw-side conductor are respectively bent and formed, and when the screw-side conductor is mounted on the contact-side conductor, the two are brought into contact with each other on a plurality of surfaces. 2. A contactor according to item 1, wherein

9. A terminal portion case made of an electrical insulating material is provided on the screw-side conductor, and when the screw-side conductor is mounted on the contact-side conductor, the screw-side conductor is displaced and the housing of the housing is removed. 2. The contactor according to claim 1, wherein a portion exposed to the outside is covered with the terminal case.

10. The contactor according to claim 9, wherein the terminal portion case is formed integrally with the screw-side conductor.

11. A guide means is provided between the housing and the terminal case to restrict relative movement in a direction perpendicular to the screw conductor while permitting relative movement of the screw-side conductor along the direction of removal. 10. The contactor according to claim 9, wherein the contactor is provided.

12. A fixed contact is provided on a housing made of an electrically insulating material, and a movable contact is disposed movably with respect to the housing, and the fixed contact of the fixed contact is a movable contact of the movable contact. A contactor that opens and closes an electric circuit by separating and contacting the In a switch including a thermal overload relay connected to a fixed contact of the contactor,

A screw-side conductor having a terminal screw for connecting a wiring cable of the electric circuit; and

And comprising a fixed contact, and wherein said thermal overload relay is

A first contact on which the screw-side conductor is detachably mounted,

A second contact detachably attached to the contact-side conductor;

A switch, characterized in that when an overload current flows between the first contact and the second contact, the switch is cut off.

13. When the screw-side conductor is attached to the first contact, the two are held in an electrically connected state while the screw-side conductor is moved in a predetermined withdrawal direction. (1) a first holding means for allowing the screw-side conductor to be detached from the contact, and, when the second contact is mounted on the contact-side conductor, holding both in an electrically connected state; Second holding means for allowing the second contact to be detached from the contact-side conductor when the second contact is moved in a predetermined removal direction; and

13. The switch according to claim 12, further comprising: a switch.